Refer to the exhibit.
A site-to-site tunnel between two sites is not coming up. Based on the debugs, what is the cause of this issue?
An authentication failure occurs on the remote peer.
A certificate fragmentation issue occurs between both sides.
UDP 4500 traffic from the peer does not reach the router.
An authentication failure occurs on the router.
https://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/113594-trouble-ios-ike-00.html#anc12
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